Electric-arc lamp.



' No. same. Patonted Aug. 27, rem. M r. B. BADT'.

ELECTRIC ABQ LMIP. (Application men mi. 25, 1901.

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U ITED STATES To all whom it may concern.-

Be it known that I, FRANCIS B. BADT, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Arc-Lamps, (Case No.1,) of l which the following is a full, clear, concise, and exactdescription, reference being had to l the accompanying drawings, forminga part of this specification.

My inventionrelates to arc-lamps, and has for its object the provisionof an improved support for the globe that may be adaptable to any formof arc-lamp, and, second, the provision of an improved yielding clampingdevice for that supplemental globe or casing used in inclosed-arc lampsthat is usually inclosed within asecond globe, whereby the supplementalarc in closing globe may be readily placed in position, while throughthe agency, of the improved support it is also adapted to be unseated topermit of the escape of accumulated gas.

The mechanism of the lamp, as is well known, is'usually contained withina casing located above the carbons, while the main outer globe issuspended in some way by mechanism that permits the globe to be elevatedabout the carbons or be lowered away from the carbons when the lamp isto be trimmed or for other purpose. Heretofore rather unsatisfactorymechanism has been employed for i this purpose. For inclosed arc lampschains have been employed to suspend the outer globe and to secure itsadjustment relative to the carbons. This feature of my invention may besaid to comprise positive globe-retaining means in the form,preferably,1 of rods that are movable relatively to each other longitudinally,which rodsare diametrically disposed with respect to the globe andpreferably extend within the casing containing the lamp-operatingmechanism. One of each pairof the relatively movable or telescoping rodsis secured to the globe, while l the otherserves when the globe isbeinglow ered toengage some portion fixed with respect to themechanism-casing, so that as the globe is lowered both members of eachpair of rods are adapted to move downwardly, whereby the globemay belowered to a much ATENT FFICEQ.

FRAhTCIS B. BADT, or oHroAeo, ILLINOIS. ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 681,179, dated August2?, 1901. Application filed February 25,1901. Serial n. 43,732; (Nothan.)

greater extent than the height of the mechanism-casing.

The improved clamp of my invention for supporting the innerarc-inclosing globe or casing is preferably in the form of a bifurcatedspring clamping member that is best formed from strip spring metal,which clamping member is anchored at its intermediate portion to thegas-cap. This bifurcated clampingmemberprojects,preferably,slightlybeyond the diameter of the inner globe, and consequently when in placetends to thrust the globe to one side, and to prevent the globe frombecoming dislodged I provide a nose located diametrically opposite tothe point of attachment of the clamping-spring to the gascap thatengages the upper flanged portion of the inner globe and prevents itsdisplacement.

I will explain my invention more fully by reference to the accompanyingdrawings, in which- Figure l is a sectional elevation of themechanism-casing, the globe, and globe-sus* pending means, otherfeatures of the lamp being omitted for the sake of clearness, as theseare well understood by those skilled in the art. Fig. 2 is a detail ofastructuralfeature entering into the mechanism illustrated in Fig. 1.Fig. 8 is asectional View showing the mechanism constructed inaccordance with my invention for holding the inner globe in place. Fig.4 is a sectional plan view on line 4 4: ofFig. 3. Fig. 5 is a detailView of another means of supporting the clamp. Fig. 6 is a view on line6 6 of Fig. 5.

Like parts are indicated by similar char acters throughout the dilferentfigures.

Themechanism of the lamp need not be illustrated, as the particular formof lamp does not constitute part of my present invention, and any of theWell-known forms which are familiar to those skilled in the art may beused.

The casing a is designed to contain the operating mechanism. This casingis preferably provided with a downwardly-extending apron b, which servesas a shield for the outer globe c. The globe c is preferably providedwith a groove (Z at its neck, with which a ring 6 may be engaged throughthe agency of ing means also enter the additional extension-rods ii,that are preferably tubular and through which preferably theextension-rods h h are adapted to move. The upper ends of theextension-rods h h are enlarged and i are limited in their downwardmovement" with respect to the rods 11 'i by having these enlargementsengage corresp'o'ndinga-nd co-' acting enlargements provided upon thetubes The tubesi 1' are preferably closed and capped at-their' upperends.

j When theglobeof the lamp iselevatedand is to be-clamped imposition,retaining devices are employed, which are preferably in the form ofenlargements k k, fixed with relationtotlie'rods h h and placed adjacentto the ringe, which enlargements 7c is are provided with recesses Z Z,that are adapted to engage any suitable form of stops, whichareprererably in the form of thumlrserews m m to secure their positiveaction. When the outer globe is to be lowered, the thumb=sorewsareloosened, whereupon the globe of its own weightniay bepermitted todescend. Owing to the telescopic arrangement of the rods h h and z 2',the outer globe may be lowered s-uf fic'ient-ly to" perm-it accesstot-he carbons of the lam'p; As the globe is lowered the lower ends ofthe rods 1' 7 come in contact with the floor of 'thernechanismmasing,thereby limiting'thedo'wnward' movement of the sections 3 i The rods 7rh, however, may still continu-e their downward movement until the head-supon the upper ends thereof engage thelower'ends of the tubes The globesup orting rods are preferably sealed within the mechanism-casing.

The inner arc-inclosingglobe it may be of enlarged portion at the upperend thereof and which is entirely closed at the lower end. With the rimthe device of the bifurcated spring-clamp o of my improvedconstr'lrc'tio'n is adapted to engage.

The clamp is anchored at itscentral portion by means'o'f athumb-screwp,that passes through the gas capq. The hole provided in the centralportion of the spring-clamp is somewhat larger than thestem of the thumbserewp, so that when the screw is loosened the spring-clamp mayoccupy a diiierentangular position with respect thereto than when theclamp is tightened in place. This enlarge-ment may be of oval shape, soas to provide a greater diameter in a radial line from the carbon, asthe swinging motion of the bifurcated globe-clamping spring is onlyrequired to be in an up-and-down direction. By this arrangement theremoval and replacetion will permit the inner arc-inclosing globe to bemomentarily unseated from the gas-cap to permit from time to time theescape of the as'formed in the burning of the lamp.-

In Figs. 5 and 6 I have shown a modified form of suspension for thespring-clamp, con= sisting of a post 8, suit-ably anchored in position,to which is pivoted a-rod t, that carrie's the'spring-c'lamp at itslower end. The p'o intof pivotal connection is preferably provided witha pivotal clampin'g-screwu, that atonce forms the pivot about which thespring-clamp may be rotated and also serves to secure the sprin g-clampin the angular position to which it has been adjusted;

v In addition to the clamping-screw Wliieh'is illustrated in Figs. 5 and6 a spring 4; may be employed, that is adapted for engagement with onecam-surface to maintain the globecla'mping spring in one position ofangular adjustment, as illustrated, orthisspring may .engage'the othercam-'surfacew, which may serve to hold the globe-clamping spring inanother position of angular adjustmenhso that the lamp-trimmerby'thrnst-in-g'the'globecl'amping spring in one direction or the othermay engage the same'with or disengage it from the globe.

It isobvious that changes may be made from the embodiment of myinvention herein shown and particularly described, and I do not,therefore, wish to permitted to the'pre cise disclosures herein setforth; but,

Having thus set forth my invention, I claim .as new and desire to securebyLetters Pat entthe construction in which there is a rim or i 1. In anarmamp, the combination with a globe therefor, of a ring engaging theupper edge portion of the globe, thesa'id ring being provided wit hpassages extending th-ro ugh the same in a vertical direction, thesaidpassages being cupped at their lower portions-rods h, h passing throughthe-ring and provided" with enlarged ends'g, g, and means whereby thesaid rods h, It may be permitted.- verti'cal movement and limited intheir vertical movement,- s'ubstanti all y as described.

2. In an arc-lamp, the combination with a globe therefor, of a ringengaging the upper edge portion of the globe, the said ring beingprovided with passages extendingthrough the same in a verticaldirection, thesaid passages being cupped at their lower portions, rodsh,

h passingthrough the ring and provided withenlarged ends 9, g, rods '5,z' having telescopic engagement with the rods h, h, meanswhere by thetelescoping rods may have their relargd tive longitudinal movementlimited, and f means for limiting the downward movement Tot both pairsof telescoping rods, substantially as described.

3. In an inclosed-arclamp, the combination with a gas-cap, of anarc-inclosing globe, a bifurcated spring-clamp having its tongues Iengaging the upper portion of the said globe, wand means coacting withthe spring-clamp for preventing the lateral displacement of the globe,substantially as described.

1 4. Inaninclosed-arclamp,thecombination with a gas-cap, of anarc-iuclosing globe, a bifurcatedspring-clamp having its tonguesengaging the upper portion of the said globe, 1 and a nose locatedopposite the spring-clamp for engaging theglobe, and in cooperation withthe spring-clamp serving to prevent the lateral displacement of theglobe, substanatially as described. I j q 5. Inaninclosed-arclamp,thecombination with a gas-cap, of an arc-inclosingglobe, a

sprin g-clam p engaging the arc-inclosing globe to engage the same withthe gas-cap, and means for fastening the spring-clamp in position thatpermits a change in the angular position of the clamp with respect tothe globe, substantially as described.

6. In an inclosed-arc lamp, the combination with a gas-cap, of anarc-inclosing globe, a spring-clamp engaging the arc-inclosing globe toengage the same with the gas-cap, a pivotal mounting for thespring-clamp that permits of the angular adjustment of the said clampwith respect to the globe, and means whereby this angular adjustment ofthe spring-clamp may be preserved, substantially as described.

In witness whereof I here-unto subscribe my name this 23d day ofFebruary, A. D. 1901.

FRANCIS B. BADT.

Witnesses:

CHARLES A. BROWN, GEORGE L. CRAGG.

